Phosphor and method for preparing the same

• US 8,585,929 B2
• Filed: 09/23/2011
• Issued: 11/19/2013
• Est. Priority Date: 09/23/2011
• Status: Active Grant

• Current Assignee: Epistar Corporation (Ennostar, Inc.)
• Original Assignee: Epistar Corporation (Ennostar, Inc.)
• Inventors: Yeh, Chiao-Wen, Liu, Ru-Shi
• Primary Examiner(s): Le, Emily
• Assistant Examiner(s): EDMONDSON, LYNNE RENEE
• Application Number:
  US13/243,672
• Publication Number:
  US 20130075660A1
• Time in Patent Office: 788 Days
• Field of Search: 252/301.4 F, 252/301.4 R, 423/326, 423/331
• US Class Current: 252/301.4F
• CPC Class Codes: C09K 11/0883 Arsenides; Nitrides; Phosphides
• CPC Class Codes: C09K 11/59 containing silicon

Abstract

Disclosed is a phosphor and a method for preparing the same. The phosphor comprises a material having a general composition formula expressed by M₁Si₆N_8-XO_X (satisfying 0≦x≦1), where M is alkaline earth metal.

Claims

1. A phosphor devoid of rare earth elements comprising a material having a general composition formula expressed by M₁Si₆N_8-XO_X (satisfying 0<

x≦

1), wherein M is alkaline earth metal.

2. The phosphor as claimed in claim 1, wherein the phosphor is capable of radiating blue light when being excited by UV light.

3. The phosphor as claimed in claim 2, wherein the blue light comprises an emission spectrum with a peak wavelength between about 440 nm and about 470 nm.

4. The phosphor as claimed in claim 2, wherein the UV light comprises an emission spectrum with a peak wavelength between about 350 nm and about 390 nm.

5. The phosphor as claimed in claim 1, wherein the phosphor is capable of radiating red light when being excited by blue light.

6. The phosphor as claimed in claim 5, wherein the red light comprises an emission spectrum with a peak wavelength between about 600 nm and about 650 nm.

7. The phosphor as claimed in claim 5, wherein the blue light comprises an emission spectrum with a peak wavelength between about 440 nm and about 470 nm.

8. The phosphor as claimed in claim 1, wherein 0<

x≦

0.1.

9. A phosphor devoid of rare earth elements comprising a material having a composition expressed by SrSi₆N_7.95O_0.05.

10. A method for preparing a phosphor devoid of rare earth elements comprising the steps of:

providing a powder mixture comprising Si₃N₄ and at least one of M₃N₂ and MO; and

sintering the powder mixture to form the phosphor having a general composition formula expressed by M₁Si₆N_8-XO_X (satisfying 0<

x≦

1), where M is alkaline earth metal.

11. The method for preparing a phosphor as claimed in claim 10, wherein the powder mixture comprises Si₃N₄, M₃N₂, and MO.

12. The method for preparing a phosphor as claimed in claim 10, wherein the temperature for sintering the powder mixture is between 1700 and 2300°

C.

13. The method for preparing a phosphor as claimed in claim 10, wherein the time period for sintering the powder mixture is between 2 and 4 hours.

14. The method for preparing a phosphor as claimed in claim 10, wherein the pressure for sintering the powder mixture is between 0.5 and 1.5 MPa.

15. The method for preparing a phosphor as claimed in claim 10, wherein 0<

x≦

0.1.

16. A method for preparing a phosphor devoid of rare earth elements comprising the steps of:

providing a powder mixture comprising Si₃N₄ and at least one of M₃N₂ and MO; and

sintering the powder mixture to form the phosphor having a composition expressed by SrSi₆N_7.95O_0.05.

17. A phosphor devoid of rare earth elements consisting essentially of a material having a general composition formula expressed by M₁Si₆N_8-XO_X (satisfying 0<

x≦

1), wherein M is alkaline earth metal.

18. A method for preparing a phosphor devoid of rare earth elements comprising the steps of:

providing a powder mixture comprising Si₃N₄ and at least one of M₃N₂ and MO; and

sintering the powder mixture to form the phosphor consisting essentially of a general composition formula expressed by MISi₆N_8-XO_X (satisfying 0<

x≦

1), where M is alkaline earth metal.